Note 9 - Cash Dividends (Details Textual) - USD ($)	9 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Apr. 30, 2016
Subsequent Event [Member]
Quarterly Indicated Per Share Dividend Rate			$ 0.05
Payments of Ordinary Dividends, Common Stock	$ 2,959,000	$ 2,172,000
Dividends Accrued	$ 7,965
Annual Indicated per Share Dividend Rate	$ 0.20

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Name:	us-gaap_PaymentsOfDividendsCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration